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*Excludes Observations that spanned multiple years

Pre 197024
19701
19711
19721
19730
19741
19751
19762
19772
19782
19790
19801
19810
19824
19832
19840
19851
19862
19871
19881
19892
19901
19917
199214
19937
199412
199510
199611
199737
199823
199913
200025
200120
200217
20033
20046
20055
20061
200710
200829
200935
201028
201137
201233
201311
20145
201512
20166
20174
20183
20190
20203
20210
Total477