*Excludes Observations that spanned multiple years

Pre 19702
19701
19710
19720
19730
19740
19751
19760
19770
19783
19792
19801
19810
19820
19830
19844
198518
19860
198712
198818
19893
19903
1991161
1992119
199367
199448
199555
19961
19976
199812
19993
20005
200123
200215
200337
200421
20056
200616
200710
200826
200919
20104
201114
201216
201318
201421
201511
201626
201722
201851
201998
20201
20210
Total1000