*Excludes Observations that spanned multiple years

Pre 19707
19700
19711
19720
19731
19740
19750
19760
19770
19781
19790
19800
19811
19820
19832
19840
19850
19860
19878
198826
19891
19909
199115
199221
199325
199412
199518
19964
199713
19982
19993
200013
20011
20021
20032
20040
20052
20061
20071
20087
200910
201011
20116
201233
201328
20146
20153
201611
201712
20187
20197
20206
202113
20221
Total352