*Excludes Observations that spanned multiple years

Pre 19701
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
198814
19890
19900
19918
19920
199361
19941
19956
19960
19971
19980
19991
20000
20010
20020
20030
20040
20050
20060
20070
20083
20094
20100
20110
20120
20130
20140
20150
20160
20170
20180
20190
20200
Total101