*Excludes Observations that spanned multiple years

Pre 197080
19702
19711
19723
19737
19745
19754
19762
19772
19783
19791
19808
19814
19821
19831
19840
19850
19861
19871
19881
19894
19903
19912
19924
19933
19942
19954
19965
199721
199810
199912
20007
20015
20024
20031
20044
20059
20066
20075
200817
200935
201026
201118
201233
201312
20143
20152
201610
20170
20181
Total395