*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19782
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19895
19900
199113
19923
1993116
19944
19958
19960
19971
19980
19990
20001
20010
20023
20030
20045
20050
20060
20071
20086
20094
20100
20110
20120
20130
20140
20150
20163
20170
20180
20190
20200
Total176