*Excludes Observations that spanned multiple years

Pre 19701
19700
19711
19720
19730
19741
19750
19761
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19870
19880
19890
19900
19910
19921
19930
19940
19950
19960
19970
19980
19991
20001
20010
20020
20030
20040
20050
20060
20070
20081
20090
20100
20110
20120
20130
20140
20157
20160
20170
20181
20190
20205
20210
20226
20232
20242
Total32