*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19852
19863
198717
198814
19896
199029
199121
19922
19931
19942
19950
199616
19975
19980
19992
200013
20010
20020
20031
20041
20050
20061
20071
20080
20092
20101
20110
20121
20130
20141
20150
20160
20171
20183
Total146