*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000123
1970000101
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000101
1984000101
1985000000
1986000505
1987000303
1988001214
1989000112
1990000112
1991001102
1992001438
1993002338
199400511420
1995001326
1996001359
1997001113
1998000358
199900141015
20000032510
2001001023
2002001405
20030026210
200400231217
2005001618
2006000549
2007004101933
20080019313
200900315018
201000423532
201100325533
2012006039
2013001110223
2014000639
201500014216
2016000202
2017001023
2018000000
Total0057189108354