*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19801
19810
19820
19830
19840
19850
19860
19870
19880
19890
19901
19918
19922
19930
19940
19950
19962
19970
19980
19993
20000
20010
20021
20030
20041
20050
20060
20070
20080
20090
20100
20110
20120
20130
20140
20151
20160
20170
20181
20193
20201
20212
20224
20232
20242
Total36