*Excludes Observations that spanned multiple years

Pre 1970159
19702
19710
19722
19731
19741
19751
19762
19773
19782
19793
19803
19812
19820
19830
19841
19852
19861
19871
19881
19891
19901
19913
19920
19932
19943
19955
19964
199712
19984
19994
20004
20012
20025
20033
20043
20054
20066
20071
20088
200911
201017
20112
20129
20137
20140
Total308