*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000009494
1970000033
1971000077
1972000055
1973001045
1974001056
1975003058
1976001056
19770030811
1978001056
197900100717
19800030710
19810040812
19820020911
1983000088
198400101112
1985010067
198606801226
1987041001226
198800501318
19890760821
199002170937
1991116180742
1992214290651
1993216420969
199414910809167
1995313130010156
1996744120011182
1997152232012297
1998038244010292
1999027143012182
2000242243015302
2001421359013397
200223225709300
2003020315014349
2004241256012311
20052123310012447
20061131214012358
2007114140317175
20080228057114
2009050123012185
20102103127016248
20110143136016295
2012010076016192
20131175901188
2014031440681
20150172701155
20160144901275
2017093201455
20180440311
201903100132
Total341273398385665864