*Excludes Observations that spanned multiple years

Pre 19703
19700
19711
19720
19730
19740
19750
19762
19770
19780
19790
19802
19810
19820
19832
19840
19851
198621
198714
198815
198925
199024
199159
199243
199347
199428
199519
199623
199733
199828
199932
20005
200134
200211
20039
200426
200522
20065
20076
200810
20093
20106
201110
20120
20130
20141
20155
201622
20173
Total600