*Excludes Observations that spanned multiple years

Pre 19700
19702
19710
19720
19730
19741
19750
19760
19770
19781
19790
19800
19810
19821
19832
19840
19851
19862
19874
198824
19898
19909
199119
199217
19938
199413
199525
199611
199729
199816
19993
200017
20010
20022
200311
20048
200513
20063
20071
20082
20092
201013
201110
20123
20130
20141
20150
20160
20170
Total282