*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19761
19771
19780
19791
19801
19810
19821
19831
19841
19851
19861
19871
19881
19892
19900
19915
19920
19930
19946
19957
199615
19978
19987
19996
20002
20014
20022
20038
20046
20056
20063
200710
200811
20099
201019
20119
20126
20135
20146
20155
201613
20175
20185
20198
20205
20218
20227
202322
20240
Total253