*Excludes Observations that spanned multiple years

Pre 197022
19700
19710
19720
19731
19740
19751
19764
19772
19780
19794
19801
19811
19821
19833
19844
19854
19861
19872
19881
19891
19902
19912
19921
19933
19943
19952
19966
19972
19987
19992
20002
20011
20022
20034
20049
200516
200610
20076
200813
20098
201011
201112
20126
20132
20145
20151
20164
20171
Total196