*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197010101113
1970000022
1971000033
1972000000
1973000022
1974001001
1975000022
1976000033
1977001056
1978000011
1979000000
1980000022
1981000055
1982020024
1983001034
1984001034
1985001056
19861050814
19870160411
1988001001222
19890041510
1990005005
19910050611
199203801021
199301801019
199408901229
19951680722
199603260837
199700901322
19980290617
199902201721
20000050914
20010300710
2002005027
20031230511
200405170729
2005021001123
200600711018
2007021001729
200801521018
20092060311
201014170123
201100160521
201220121924
20131071817
20140920011
20150080210
2016011035
2017001023
Total10572526278603