*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000088
1970000000
1971000000
1972000000
1973000000
1974000000
1975000011
1976000022
1977002035
1978000011
1979000022
1980000022
1981000044
1982000033
1983000011
1984000033
1985102014
1986022026
1987102047
19880260311
1989113049
19900430411
19912470316
19920270615
199321050320
1994015110834
1995191401034
199611160321
199701390830
1998211110327
1999210110831
2000116200845
2001216140840
200208230334
2003131220559
2004027160447
2005235490490
2006231240663
200707330545
2008117410463
20090455305103
201014313501180
2011115179011206
2012042180012234
2013010481867
201401930729
201500160622
2016022015
2017010056
2018000011
2019010001
2020000000
Total2446095912041648