*Excludes Observations that spanned multiple years

Pre 197044
19701
19710
19721
19730
19740
19750
19764
19774
19780
19790
19800
19811
19820
19830
19840
19850
19860
19870
19884
19893
19908
19915
19926
19930
199411
19955
19963
19978
19983
19992
20006
20019
200218
20036
20040
20051
20064
20071
20082
20092
201023
20111
201223
20132
20141
20151
201610
20172
Total225