*Excludes Observations that spanned multiple years

Pre 19709
19700
19713
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19852
198639
1987102
1988164
198918
199014
1991118
199272
1993129
199412
1995171
199690
1997140
199810
1999125
200046
200129
200222
20038
200417
20054
20062
20073
20085
20095
20101
20114
20123
20136
20143
20151
20162
20177
201818
201929
202041
202191
202248
202365
202427
Total1705