*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197213
19732
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19881
19892
19900
19917
19920
19930
19941
19957
19965
19974
19980
199914
200014
20014
200217
20039
20040
20054
20062
20072
20082
20097
20101
20110
20124
20130
20142
20156
20164
20171
20180
Total135