*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970002013
1970001001
1971001001
1972001001
1973001012
1974000000
1975002002
1976002002
1977001001
1978002013
1979001001
1980011002
1981000011
1982001001
1983001001
1984001001
1985102014
1986005027
19870160310
1988015006
19890570214
19900640414
19913480116
1992255120069
199318060188
199404001505420
199514071103422
19960312500317
19971129801139
19981319503328
199904080149
200002751002287
2001078120292
200212271200240
200315340361
20040264701272
200501151200127
20061114402121
20070114803125
2008065180083
200908170025
20100653700102
2011134161153
201204310145
201307580083
201405630059
2015000000
2016151007
2017000000
Total1533512951463708