*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19843
19850
19860
19870
19881
19891
19903
19915
19923
19932
19947
19954
19963
19971
19980
19992
20007
20016
20021
20034
20045
20053
200614
20072
200830
20094
20103
20118
201213
201310
20140
20150
20160
20170
20180
20190
20200
20210
20220
Total145