*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19841
19850
19860
19870
19880
19890
19900
199134
19920
19930
19940
19951
19960
19970
19980
19990
20000
20010
20020
20030
20040
20050
20061
20070
20080
20091
20100
20110
20121
20130
20140
20151
20160
20170
20180
20192
20200
20212
20224
20230
20240
Total50