*Excludes Observations that spanned multiple years

Pre 19700
19701
19710
19720
19730
19740
19750
19760
19771
19780
19791
19800
19810
19820
19830
19841
19850
19860
19870
19880
19890
19900
19919
19920
19936
19944
199510
19960
19971
19983
19991
20000
20019
200210
20033
20040
20051
20062
20070
20085
20090
20105
201111
20121
201312
20140
20150
201622
201724
201857
201936
202050
202140
202270
202351
20242
Total449