*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19771
19781
19790
19800
19811
19822
19831
19841
19850
19862
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19971
19981
19994
200016
20011
20020
20030
20041
20050
20061
20070
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
20180
20190
20200
20210
20220
20230
20240
Total34