*Excludes Observations that spanned multiple years

Pre 19703
19700
19711
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19831
19840
19850
19860
198712
198843
198915
19907
199127
199230
199336
199411
199518
19969
199712
19986
199939
200036
200124
200211
20031
20043
20050
20063
20074
20086
200916
20103
20116
20122
20131
20140
20151
20167
20176
20185
20191
20201
20210
20220
Total408