*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000106162
1970001012
1971001034
1972001056
1973000044
1974001023
1975000033
197600201214
197700501015
19780050813
1979110601229
1980110401126
198150701325
198290801532
198391401226
198430001417
198511301823
198632902135
198743601932
198874901838
1989211201530
19906132721462
199118123612087
19928233501581
1993671422150
1994132142025101
1995754022781
19968133601572
1997554912888
199813145101694
19993122501858
20003114702283
20018213902997
2002734002070
20038174302088
2004141155022102
2005151182021129
200623550124103
20071684922398
2008152175118130
2009174113116151
2010191413908180
201112610503126
20126768027108
20137999010125
201462053203246
2015233450273
2016113130330
2017312017
Total3654971536137483159