*Excludes Observations that spanned multiple years

Pre 197069
19700
19710
19720
19731
19743
19752
19761
19773
19782
19794
19802
19810
19820
19831
19840
19854
198631
198736
1988155
198953
199013
199154
199257
199364
1994198
1995164
199656
199779
19989
199985
200040
200130
200250
200343
200455
200542
200635
200742
200863
200950
201067
201149
201253
201360
201459
201553
201645
201750
201817
201995
202014
202135
202240
202325
20245
Total2263