*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19822
19832
19841
19853
19863
19872
19881
19893
199013
199115
19920
19934
19941
19954
19960
19972
19980
19990
20000
20014
20020
20034
20040
20050
20061
20070
20082
20090
201068
201160
20120
20131
20142
201523
201621
201715
20181
Total259