*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970002002
1970000000
1971000000
1972001001
1973000000
1974003003
1975001001
1976011002
1977103015
1978014016
1979101013
1980000022
19810450312
1982131005
1983002002
1984002013
1985000011
1986003014
1987013026
1988102014
1989006039
199005161123
1991015028
1992011110022
199300220426
199409110222
19950770115
199605100217
1997116019
19981640213
1999018009
20000370414
200101930123
2002014038
2003003014
20040830213
200503280132
2006008019
2007025018
20080870116
2009004004
20100470112
20110090110
2012017019
2013001001
2014050005
2015012003
2016010001
2017000000
Total6112238150407