*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19851
19860
19870
19883
19890
19902
19911
19928
19931
19943
19955
19960
19970
19980
19990
20000
20010
20022
20030
20040
20050
20060
20070
20083
20090
20102
20110
20121
20130
20140
20150
20161
20170
Total34