*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970100001
1970000000
1971000000
1972000000
1973000000
1974100001
1975000000
1976100001
1977100001
1978000000
1979000000
1980000101
1981000000
1982100102
1983000000
1984000101
1985000000
1986000000
1987101103
1988100102
1989010001
1990000101
1991000101
1992000000
1993000011
1994000066
1995100247
1996000033
1997000202
1998100045
1999100102
2000000437
20012013410
200220041824
20030006915
20042008919
2005200169
2006300328
20076005819
20082004410
200900111315
201000010515
20110007411
2012400127
2013000246
2014000033
2015000415
2016000213
2017000101
2018000000
Total331388104229