*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19792
19800
19810
19820
19830
19840
19850
19860
19870
19887
19896
19901
199114
199228
199345
19942
19953
19965
199715
19980
199921
20000
200110
20021
20030
20042
20050
20060
20071
200810
20094
20106
201110
20121
20132
20140
20150
20161
20172
20181
20190
20200
20210
Total200