*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
199046
19919
19927
199311
199412
199538
199626
199756
199834
199914
200036
200152
2002168
200311
20049
200525
200620
200712
200817
20093
201012
201125
201225
201314
201440
201531
201615
20179
201811
201916
20208
Total917