*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19724
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19840
19850
19863
19874
19884
19895
199022
19918
199227
19933
19942
19951
19961
19970
19980
19999
200011
200111
200212
20030
20041
20050
20061
20071
20085
20090
201011
20115
20120
20130
20141
20150
20160
20171
20180
20190
Total154