*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19862
19870
19880
19890
19900
19911
19925
19931
19940
19955
19960
19973
19982
19990
20000
20010
20020
20030
20040
20050
20061
20070
20084
20091
20100
20110
20122
20130
20140
20150
20160
20171
20181
20195
20204
20213
20223
20236
20240
Total51