*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19851
19860
19870
19880
19890
19900
19910
19920
19930
19941
19951
19960
19971
19980
19997
20000
20012
20025
20031
20049
20054
200621
200728
20088
200912
201015
20117
201213
20136
20148
20151
20160
20170
20180
Total151