SemGroup|1965|1966|1967|1968|1969|1970|1971|1972|1973|1974|1975|1976|1977|1978|1979|1980|1981|1982|1983|1984|1985|1986|1987|1988|1989|1990|1991|1992|1993|1994|1995|1996|1997|1998|1999|2000|2001|2002|2003|
Activities & Behaviors|1664|9671|14150|25066|28075|26208|27874|37777|36378|41174|44737|42201|41976|44530|57052|46091|44449|47868|53997|56530|60989|63549|62057|65806|83011|82129|88563|104928|98449|107893|117760|110153|142468|130432|137784|132132|143217|177418|164011|
Anatomy|9037|72767|106713|157766|193303|193912|192634|243612|233355|256363|273163|246710|235176|207121|227980|234372|253453|260825|279309|282765|290239|295385|274517|276144|327896|315645|329056|364429|328818|338464|355624|331924|428639|371051|391236|367574|402874|389873|364259|
Chemicals & Drugs|27705|239722|367759|518989|617662|604272|606691|807727|761388|838607|870402|791926|776173|647858|711454|761335|833865|904955|961221|986469|1049500|1085657|1021481|1044325|1245009|1247925|1329597|1483184|1353797|1403979|1512106|1450590|1868373|1648343|1761561|1704049|1909428|1825899|1719653|
Concepts & Ideas|2868|19869|30777|77311|107773|101780|105274|140195|140774|164497|162567|150132|145472|135568|166430|160275|157956|172901|186728|192508|207248|214092|198415|210911|266114|290047|326446|386737|376312|413744|454952|448040|557983|511849|558868|545434|617323|664614|642821|
Devices|652|3724|5077|9092|10209|10088|9502|12710|13064|13657|14540|13490|13349|13621|13345|14316|13712|14354|15701|16014|16882|17662|15554|15565|19109|20855|20994|24418|20754|22707|23211|22903|29138|26126|26961|23769|29918|32143|30862|
Disorders|23511|153397|188412|311035|350514|349070|337449|373945|352744|373262|384435|371217|366058|328987|342059|348229|389417|395243|428673|434862|452959|464269|433990|436208|516171|499126|508945|559694|498525|524920|549686|525436|662634|589185|620738|596498|652862|677960|640501|
Genes & Molecular Sequences|26|462|948|1820|2302|2602|2975|4585|4507|5110|6044|5551|5949|5265|6526|6690|8351|9450|12819|14911|15283|17055|22066|31494|42964|57342|71159|87787|93689|107728|116752|107871|97283|85242|87010|83462|89357|80685|76533|
Geographic Areas|2600|16690|19618|28494|34523|30160|29407|34191|32443|41007|41885|43971|41398|46081|47064|49196|41484|45410|48475|48400|50231|49788|50885|53651|65447|61718|67234|73677|69885|71550|79511|74748|87920|86145|88619|85150|90551|106957|95287|
Living Beings|24325|174482|219126|301582|338540|329907|309924|369934|341304|367396|402995|410997|405872|371262|388710|412240|463904|487898|529001|526898|536199|544669|524460|531517|645888|608308|625256|693993|642305|671000|708324|671613|855146|752933|797796|759319|825700|845986|798945|
Objects|1163|8180|12066|18458|23104|22776|22552|28551|26780|30399|29578|26878|26296|26534|28957|27678|27442|27556|32896|32998|33801|34905|32501|33964|38434|38590|38711|44934|38948|40519|43669|41893|54524|51859|53796|52314|60559|66325|65613|
Occupations|4839|34431|37787|51086|55404|47971|51956|50341|42348|49877|45319|45236|42086|39990|42268|44061|39243|40708|44327|42759|46272|45125|42493|42509|50171|45509|46776|53058|48791|50230|56212|52147|64891|58966|62321|62698|66295|79967|71534|
Organizations|612|4248|5492|8566|10513|9438|9236|11223|11009|13141|12728|11719|12803|17333|22197|17745|15521|14842|17199|17350|18180|18913|19624|20241|23147|22789|22965|27765|25536|25494|27775|25360|29539|28858|29112|25786|27177|33554|29226|
Phenomena|1434|11525|19016|31896|39057|40986|42382|62224|53868|61497|62307|55217|47779|40704|46461|46716|46738|47645|51319|53155|55639|58446|52996|56021|67545|67824|71224|81513|72176|76030|82761|79754|102416|96539|101626|102770|119925|127975|128390|
Physiology|6456|40896|66740|114953|142622|136956|145126|185543|176050|190545|191242|180701|171548|149345|165505|167271|176293|185660|199264|202478|211794|216066|202136|204362|250406|251144|268912|301219|276990|292621|314940|303431|393717|351285|381546|374156|421061|425279|408765|
Procedures|14391|97805|134349|202631|232693|232910|231562|283729|277065|313007|302303|235692|234817|222026|248650|252122|267148|275160|301383|322149|338834|358174|343266|364664|467234|469122|499848|565493|513811|550762|588892|564099|725876|654330|698567|675334|747578|780964|747397|