*Excludes Observations that spanned multiple years

Pre 19701
19701
19711
19726
19731
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19840
19850
19863
19870
19880
19890
19900
199116
19920
19931
19943
19950
19960
19971
19981
19992
20001
20010
20022
20033
20040
20050
20061
20070
20080
20090
20100
20111
20121
20130
20143
20151
20161
20170
20180
Total52