*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19821
19830
19841
19854
19866
19877
19881
19890
19902
19911
19920
19932
19940
19955
19960
19970
19980
19990
20000
20011
20020
20031
20040
20051
20060
20070
20083
20090
20100
20110
20120
20131
20140
20150
20162
20172
20180
20193
20205
20213
20226
20238
20242
Total68