*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19822
19832
19840
198510
198645
19875
198817
198924
199011
19916
19924
199323
199416
199543
19968
199728
199844
199921
20006
200122
200222
20032256
2004710
20051208
2006486
2007589
2008250
20092031
201013
201110
20128
201315
201445
201547
2016169
2017388
20181
Total8586