*Excludes Observations that spanned multiple years

Pre 19706
19700
19711
19721
19730
19740
19750
19763
19771
19780
19790
19802
19810
19820
19832
19841
19851
198622
198714
198819
198927
199024
199161
199244
199348
199428
199519
199624
199733
199828
199934
20006
200134
200211
20039
200427
200522
20066
20078
200815
20094
20106
201110
20120
20132
20144
20155
201627
20175
20180
Total644