*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19850
19860
19871
19882
19896
19901
19914
19921
19932
19942
199511
19961
19970
19980
19991
20000
20010
20020
20030
20040
20050
20061
20077
20082
20093
20102
20110
20121
201317
20148
20150
20161
20171
20180
20190
20200
20211
20221
20231
20242
Total81