*Excludes Observations that spanned multiple years

Pre 197030
19700
19713
19721
19736
19740
19756
19766
19770
19784
19794
19802
19814
19822
19837
19844
198512
198614
19874
198815
19898
19908
19913
19926
199311
199413
199519
199611
199717
199817
199925
200021
200128
200227
200324
200436
200547
200652
200729
200837
200951
201038
201133
201218
201321
20145
20150
20160
20170
Total729