*Excludes Observations that spanned multiple years

Pre 19704
19700
19710
19721
19730
19741
19751
19760
19770
19784
19790
19801
19810
19820
19830
19841
19854
19860
19871
19888
19892
19903
19910
199210
19932
19943
19953
19961
19974
19981
19993
20004
20011
20021
20030
20042
20053
20062
20076
20082
20092
20101
20111
20121
20137
20140
20150
20160
20170
Total91