*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19860
19870
19880
19891
19900
19910
19920
19930
19940
19951
19960
19970
19980
19991
20000
20011
20020
20031
20040
20050
20060
20070
20081
20092
20101
20115
20120
20130
20140
20150
20160
20170
20180
20190
20200
20211
20220
20230
20240
Total17