*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19732
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19911
19920
19937
19940
19950
19961
19970
19980
19990
20001
20010
20020
20030
20041
20050
20063
20070
20080
20090
20100
20111
20121
20132
20140
20150
20161
20170
20182
20191
20203
20212
20222
20230
20240
Total31