*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19862
19871
19881
19890
19903
199115
199228
19931
19940
19950
19960
19970
19980
199928
200026
20012
20020
20030
20040
20051
20061
20072
20080
20090
20100
20110
20122
20130
20140
20150
20169
20175
20180
Total127