*Excludes Observations that spanned multiple years

Pre 197064
19703
19710
19720
19731
19741
19752
19760
19772
19780
19790
19801
19813
19823
19830
19840
19850
19861
19870
198814
198910
199045
19915
19927
199311
199412
199513
19967
199727
199834
199912
200035
200120
200244
200310
20049
200525
200620
200712
200817
20093
201012
201125
201210
20139
201412
201525
20165
20171
Total572