*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19811
19820
19832
19840
19855
19860
19870
19880
19896
19900
19913
19920
19930
19940
19958
19960
19971
19980
19990
20000
20011
20023
20031
20040
20051
20060
20070
20081
20090
20100
20110
20121
20130
20140
20150
20165
20170
Total41