*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19722
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19834
19840
19850
19868
19873
198822
19895
199020
199123
199220
19939
199425
199528
19960
19974
19980
19993
20000
20010
200213
20034
20040
20052
20060
20071
20086
20090
20100
20111
20120
20130
20140
20150
20160
20172
20180
20190
Total205