*Excludes Observations that spanned multiple years

Pre 19701
19700
19711
197231
197312
19740
19750
19760
19770
19782
19791
19800
19810
19821
19834
198495
198544
198681
1987171
1988218
198985
199077
1991131
199255
199335
199419
199514
199615
199722
19989
199948
2000101
200146
200235
200398
200485
2005103
200690
200785
200882
200988
201082
201193
2012140
201393
201498
201590
201692
201778
20183
Total2754