*Excludes Observations that spanned multiple years

Pre 19708
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19860
19871
19881
19890
19900
19919
19920
19932
19940
19953
19960
19970
19982
19991
20004
20010
20020
20030
20040
20056
20061
20070
20080
20090
20100
20110
20120
20130
20140
20150
20161
20170
20180
20191
20202
20211
20220
20236
20240
Total50