*Excludes Observations that spanned multiple years

Pre 197013
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19804
19810
19820
19830
19840
19850
19860
19871
19882
19890
19901
19910
19920
19934
19941
19950
19963
19977
199810
199910
200010
20019
20027
200311
20047
20056
200624
200716
200816
200915
201041
201135
201219
201316
201416
201517
20164
20170
20180
20191
20200
20210
20220
Total326