*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19845
19851
19868
19877
19880
19890
19900
199112
19920
19932
19949
19952
19961
19970
19981
19992
20005
20010
20024
20031
20041
20054
20061
20077
20084
20090
20100
20110
20121
20130
20140
20150
20160
20170
20181
20190
20200
Total79