*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19834
19840
19850
19867
19873
19880
19894
19900
19913
199218
19938
199425
199528
19960
19974
19980
19993
20000
20010
200213
20034
20040
20052
20060
20070
20086
20090
20100
20110
20120
20130
20140
20150
20160
20170
Total132