*Excludes Observations that spanned multiple years

Pre 197056
19700
19711
19721
19732
19740
19752
19761
19770
19780
19790
19805
19811
19822
19830
19840
19850
19862
19870
19881
19891
19904
19914
19921
19939
19944
19957
19966
19975
19984
19992
200014
20016
20025
20037
20043
20052
20061
20072
20087
20095
20102
20119
20125
20136
20142
20153
20163
20171
Total204