*Excludes Observations that spanned multiple years

Pre 1970115
19705
19716
19724
19735
19745
19757
19761
19771
19782
19796
198011
19813
19821
19830
19840
19851
19860
19870
19880
19891
19900
19913
19920
19934
19943
19955
19965
199720
19983
19995
20001
20014
20025
20034
200420
200556
20066
20074
200825
200911
201020
201149
201212
20134
201416
201539
20161
20173
Total502