*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
19871
19880
19890
19900
19910
19922
19930
19943
19950
19967
19979
19980
19997
20000
20010
20020
20030
20041
20050
20060
20070
20080
20091
20100
20112
20120
20136
20140
20150
20160
20170
20181
20190
20201
20210
20220
20230
20240
Total42