*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19726
19736
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19862
19875
19886
19890
19901
19912
19920
19930
19940
19958
19960
19970
19980
19992
200017
20011
20022
20030
20040
20050
20061
20070
200813
20094
20100
20110
20120
20130
20141
20150
20161
20173
20182
20190
20200
Total84