*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19741
19750
19760
19770
19781
19790
19802
19811
19820
19830
19841
19850
19861
19870
19880
19891
19902
19910
19921
19934
19944
19951
19960
19974
19980
19990
20001
20012
20022
20031
20040
20051
20060
20077
200810
20093
20101
20111
20129
20133
20141
20150
20164
20170
20182
20193
20201
20214
20226
20238
20243
Total98