*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19822
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19967
19970
19980
19990
20000
20010
20023
20032
20040
20051
20062
20070
20081
20090
20100
20110
20120
20130
20140
20150
20162
20171
20184
20191
20202
20212
20221
20230
20240
Total31