*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
19872
19884
19892
19902
19913
19924
19934
19945
19955
19966
19978
19986
19997
20006
20018
20026
20036
20044
20053
20064
20078
20083
20096
20103
20113
20122
20132
20142
20154
20162
20170
20180
Total130