*Excludes Observations that spanned multiple years

Pre 197021
197011
197116
197210
19738
19746
19751
19766
19779
19784
19790
19803
19810
19820
19835
19841
19852
19868
19870
198891
1989105
199078
1991400
1992234
1993191
1994543
1995467
1996288
1997280
1998353
1999292
2000604
2001408
2002578
200313
20044
20052
200611
20071
20080
20093
201013
20118
20128
20133
201412
20157
20164
20177
20182
20190
Total5121