*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19901
199131
19920
199312
19940
19953
19960
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20087
20091
20100
20110
20123
20131
20141
20150
20161
20171
20183
201922
202015
20219
20222
20238
20241
Total123