*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19840
19850
19860
19871
19885
198913
19901
19911
199213
19932
19940
19950
19960
19974
19980
19990
20007
20010
20020
20030
20040
20051
20063
20070
20084
20090
20100
20112
20120
20130
20140
20150
20160
20170
20180
20190
20200
20210
20220
Total59