*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19863
19871
19885
19896
199017
19917
199238
199321
199412
199523
19962
19973
19980
19994
20002
20015
20026
20037
200414
20056
200624
200736
200841
200940
201040
201125
201237
201330
201443
201527
201634
201724
201834
201931
20209
202119
202217
20230
20241
Total694