*Excludes Observations that spanned multiple years

Pre 19700
19702
19711
19720
19730
19741
19750
19760
19770
19781
19790
19800
19810
19821
19832
19840
19851
19863
19874
198824
19898
19909
199119
199217
19938
199414
199525
199611
199730
199816
19994
200017
20011
20022
200311
20048
200513
20063
20071
20083
20093
201013
201110
20123
20130
20141
20152
20168
20170
20180
Total300