*Excludes Observations that spanned multiple years

Pre 197014
19700
19710
19720
19730
19740
19752
19761
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19923
19932
19940
19951
19960
19971
19980
19991
20001
20010
20021
20030
20040
20051
20060
20071
20080
20095
20106
20111
20120
20130
20140
20150
20160
20170
20182
20190
20200
Total43