*Excludes Observations that spanned multiple years

Pre 19701
19701
19710
19720
19730
19740
19750
19761
19770
19780
19791
19801
19810
19820
19830
19840
19850
19866
19872
198839
19891
19900
19916
19924
19934
19941
19955
19967
19971
19983
19990
20001
20011
20024
20030
20040
20051
20062
20070
200811
20096
20105
201132
20124
201319
20145
201515
201636
201760
201818
201957
202048
202135
202258
20231
20240
Total503