*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19751
19760
19771
19780
19791
19801
19811
19821
19837
19840
19852
19863
198721
198817
19891
19901
19918
199228
199336
19948
19956
19965
19971
19980
19998
200018
200125
200210
20030
20046
200510
20062
20073
20082
20096
20100
20110
20121
20131
20140
20152
20164
20171
20184
20194
20200
20211
20220
Total260