*Excludes Observations that spanned multiple years

Pre 19701
19700
19713
197231
197322
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19874
19881
19895
19908
199118
19925
19933
19945
19950
19960
19970
19980
199911
200021
20013
20023
20030
20042
20050
20061
20070
20080
20091
20100
20110
20120
20130
20141
20150
20161
20170
20180
20190
Total150