*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
20092070716
201014180730
201100170926
2012201411936
2013101111124
20140950418
20150080715
20160110911
20170020911
2018002002
2019122027
2020002013
2021000000
Total11592716330677