*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19732
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19851
19860
19870
19881
19890
19900
19910
19920
19931
19940
19952
19960
19970
19980
19990
20001
20010
20020
20030
20040
20050
20060
20070
20082
20090
20105
20115
201228
20131
201415
201580
201656
20177
20183
Total211