*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977001001
1978000011
1979000000
1980000000
1981000000
1982000000
1983000011
1984001001
1985000000
1986011002
1987013015
1988000011
1989003003
1990000011
1991306009
19921290517
1993021014
1994133018
1995015028
1996002002
1997006017
1998006017
1999015039
20001030610
20011230511
2002033028
200308110322
20040350210
200523630445
200611540424
20070080311
2008023005
200912130016
201002160018
201100151016
20120090312
2013001023
2014001001
2015001001
2016001001
2017000000
Total1184152153301