*Excludes Observations that spanned multiple years

Pre 19705
19701
19711
19720
19730
19740
19750
19760
19770
19782
19790
19801
19810
19821
19830
19840
19853
198610
19873
19889
19899
199019
199134
199263
199392
199410
199560
199612
19974
19982
199915
200030
20012
20028
20036
20048
20051
20061
20073
200820
20099
201015
201114
201211
201326
201411
20158
20165
20174
20185
201910
20209
20217
202213
20232
20243
Total587