*Excludes Observations that spanned multiple years

Pre 19700
19700
19715
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19867
198741
1988152
19894
199031
199159
199221
199319
19940
199517
199624
199732
19980
199910
20000
20010
20020
20031
20041
20052
20063
20072
20081
20090
20101
20110
20120
20130
20143
20150
20162
20172
20184
20194
202010
20218
202215
202319
20241
Total501