*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19904
19910
19929
19932
19940
19952
19962
19972
19980
19995
200010
200110
20028
200311
20046
20058
20061
20070
20083
20093
20100
20112
20120
20130
20140
20150
20160
20170
Total89