*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19853
19861
19878
19883
19893
19902
19916
199213
19931
19940
19950
19960
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20080
20091
20108
20118
20122
20132
20142
20151
20162
20172
20180
Total68