*Excludes Observations that spanned multiple years

Pre 19700
19700
19713
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19852
198637
1987102
1988164
198918
199014
1991117
199272
1993129
199412
1995171
199690
1997140
199810
1999125
200046
200129
200222
20034
200414
20052
20060
20070
20084
20091
20100
20112
20123
20131
20140
20151
20161
20172
20181
20193
20200
20210
20220
Total1342