*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970800008
1970000000
1971000000
1972000000
1973000000
1974000000
1975100001
1976200002
1977300205
1978100001
1979200002
1980200002
1981400004
1982300003
1983100001
1984300003
1985101204
1986200226
1987401207
19883006211
1989401319
19904003411
19913027416
19926007215
199330251020
1994800111534
1995100114934
199630161121
199780091330
1998302111127
1999802111031
2000801201645
2001802141640
200230023834
2003501223159
2004400162747
2005402493590
2006602243163
200750033745
2008401411763
2009000534598
201000113543179
201110117915196
201240018042226
201311046957
201400021618
201500016016
2016000123
2017000000
2018000000
Total1531249554541587