*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19921
19930
19940
19950
19960
19970
19980
19991
20000
20011
20020
20033
20040
20054
20069
20075
200820
200936
201025
201127
201227
201311
20145
201521
201612
20170
Total208