*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19871
19880
19890
19900
19910
19920
19930
19940
19953
19960
19971
19980
19990
20000
20010
20021
20030
20040
20050
20060
20070
20089
20091
20100
20110
20120
20131
20140
20150
20160
20171
20180
20190
20205
20211
20222
20236
20240
Total32