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|2004|
Activities & Behaviors|1664|9671|14150|25066|28075|26206|27874|37777|36377|41174|44737|42198|41976|44529|56974|46022|44417|47868|53997|56529|60984|63547|62057|65807|83012|82129|88547|104873|98438|107884|117755|110135|142479|130438|137789|132146|143214|177431|186059|188093|
Anatomy|9037|72766|106708|157761|193298|193899|192628|243602|233289|256359|273142|246688|235150|207117|227975|234144|253444|260820|279304|282750|290234|295377|274515|276143|327890|315623|329032|364398|328795|338428|355596|331892|428589|370993|391157|367536|402750|389809|411451|399205|
Chemicals & Drugs|27568|238720|366530|517197|615285|602166|604735|805064|758504|836082|867805|789647|774258|646193|709624|759069|832811|904369|960795|986378|1049496|1086090|1022014|1045205|1246434|1249975|1332759|1487801|1359803|1412698|1522845|1463910|1888957|1670989|1789478|1732860|1945650|1861413|1968751|1894255|
Concepts & Ideas|2904|20060|31074|77798|108409|102376|105946|140876|141324|165227|163427|150872|146186|136122|166974|160718|158723|173822|187628|193426|208333|215321|199549|211982|267536|291285|327761|388089|377842|415050|456170|449225|559521|513214|560313|546857|618914|666187|728590|730478|
Devices|652|3724|5077|9092|10209|10086|9502|12710|13063|13657|14540|13490|13349|13621|13345|14289|13712|14354|15701|16014|16882|17662|15554|15565|19109|20855|20994|24418|20754|22707|23211|22902|29138|26126|26960|23769|29920|32137|35201|35984|
Disorders|23462|153178|188079|310592|350153|348742|337109|373603|352228|372873|383993|370604|365478|328498|341645|347311|388997|394827|428096|434333|452449|463749|433515|435697|515659|498722|508590|559286|498269|524857|549568|525242|662495|589111|620698|596269|652667|678053|725281|697351|
Genes & Molecular Sequences|26|462|948|1820|2302|2602|2975|4585|4502|5110|6044|5551|5947|5265|6526|6690|8354|9455|12820|14918|15291|17069|22076|31497|42965|57351|71163|87795|93701|107761|116799|107929|97363|85317|87068|83550|89428|80749|85633|87063|
Geographic Areas|2600|16690|19618|28494|34523|30156|29407|34191|32440|41007|41885|43964|41398|46080|47057|49019|41481|45407|48475|48399|50230|49784|50884|53651|65446|61718|67232|73668|69884|71551|79507|74733|87924|86149|88620|85176|90592|106956|107829|106672|
Living Beings|50226|343846|395493|546282|601515|584477|545572|629504|578320|618817|677367|720577|716749|677532|708240|736578|832434|851748|927762|934399|955559|980691|965749|976795|1184612|1129240|1149131|1264812|1154850|1204340|1273387|1216246|1545585|1374984|1456303|1393994|1513008|1580650|1654460|1604482|
Objects|1163|8180|12066|18458|23104|22770|22552|28551|26773|30399|29579|26870|26286|26501|28909|27633|27417|27524|32854|32950|33760|34831|32443|33911|38356|38493|38578|44765|38818|40311|43324|41597|54148|51543|53475|51908|60091|65776|73283|72025|
Occupations|4865|34652|38081|51606|55838|48350|52322|50799|42760|50556|45830|45622|42462|40269|42574|44112|39653|41109|44732|43197|46623|45445|42758|42797|50598|45932|47078|53421|49017|50445|56356|52258|65056|59174|62510|62931|66631|80297|81350|84180|
Organizations|612|4248|5491|8502|10448|9394|9195|11167|10950|13110|12692|11676|12759|17245|22110|17650|15475|14793|17162|17315|18157|18882|19595|20225|23107|22754|22926|27709|25483|25408|27690|25268|29438|28740|28997|25716|27082|33443|33107|31140|
Phenomena|1405|11277|18648|31229|38493|40467|41892|61644|53333|60665|61667|54707|47279|40310|45984|46223|46136|47006|50650|52419|54974|57705|52330|55336|66476|66892|70362|80535|71303|75151|81951|79038|101503|95652|100747|101909|118929|127010|142685|140637|
Physiology|6502|41279|67238|116010|143869|138033|146277|187239|177362|191621|192382|181716|172525|150413|166709|168332|177442|186741|200468|203782|213155|217332|203152|205397|251667|252042|269754|302239|277801|293576|316071|304443|394928|352474|382847|375919|423169|427388|463269|460414|
Procedures|14173|96378|132091|199833|229159|229274|228236|281987|275891|311964|301213|234910|234193|221582|248088|250829|266653|274843|300975|321772|338561|358033|343150|364584|467207|468989|499695|565124|513693|550574|588733|564058|725881|654472|698596|675344|747547|780898|846277|837791|