*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
19870
19880
19890
19900
19910
19920
19930
19940
19950
19961
19970
19980
19990
20000
20010
20022
20030
20040
20051
20060
20071
20080
20090
20102
20111
20120
20133
20140
20150
20160
20170
20181
20191
20200
20210
20224
20232
20240
Total21