*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19733
19741
19750
19760
19770
19780
19791
19802
19811
19820
19831
19841
19850
19860
19870
19881
19890
19900
19910
19920
19930
19940
19950
19960
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20080
20092
20100
20110
20121
20130
20140
20151
20160
20171
20181
20190
20200
20211
20220
20231
20240
Total19