*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19862
19871
19881
19890
19900
19912
19921
19930
19940
19951
19961
19974
19980
19990
20000
20012
20020
20032
20040
20050
20060
20070
20082
20091
20100
20110
20120
20130
20140
20151
20160
20170
20180
20190
20200
20210
20220
20230
20240
Total21