*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197002505158
1970004026
1971001078
1972002046
19730040610
1974003058
19750140813
19760040610
197700801220
19780040812
1979001101021
198012601120
198100601521
1982011001627
198300401620
1984001201123
198501501218
1986011601027
1987033301652
1988112701746
19890124401672
19901602001192
19913323001075
19921112024014169
1993545738014514
1994151778820211896
1995141540352221613
1996131453441161527
1997121180411211255
1998221648491181738
19991268034118745
2000151875641301985
2001171545671331663
2002517191042171847
2003102176781162281
2004102637930202760
20051011101640241308
20061513452701271658
20071814632722261781
2008109993642141389
200917470451112951
2010318797211131645
2011225007681241315
20126666273137983
201321647605031276
201410771361001142
201553417905223
201603168512116
20171337519
Total3332784255153274234464