*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19911
19922
19930
19940
19950
19963
19970
19980
19990
20001
20010
20025
20030
200411
20050
20060
20070
20086
20093
20100
20110
20120
20130
20140
20150
20160
20170
20180
20190
20200
Total33