enUSA <-
structure(c(7.637599705, 6.96339879, 6.8826723, 6.283851135, 
6.41384507, 6.11899789, 6.27567172, 6.52603799, 6.08708414, 6.521200815, 
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8.45681248, 7.68076925, 7.776627605, 7.228451715, 7.07119447, 
7.087693615, 7.55891886, 7.41789279, 7.058216915, 7.30502889, 
7.512854395, 8.531636245, 8.40121398, 7.87183186, 8.27959358, 
7.30632654, 7.031668895, 7.23076322, 7.729163155, 7.74935902, 
7.199061525, 7.40027851, 7.725599365, 8.49890065, 9.109592675, 
8.19102211, 8.113286545, 7.37358701, 7.268071185, 7.55532131, 
7.81397566, 7.89544909, 7.28251097, 7.49361858, 7.579156925, 
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7.55585092, 7.62282443, 8.045190515, 8.35953515, 7.54196079, 
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8.698606875, 9.10709971, 8.17190762, 8.426803005, 8.619876445, 
9.14503329, 9.23779733, 8.24298719, 8.50301726, 8.52502878, 9.341950095, 
9.8080185, 9.30634279, 9.086194885, 8.405000375, 8.495192325, 
8.581636915, 8.99767089, 9.340717855, 8.42021031, 8.455967425, 
8.58199878, 9.66036281, 9.97510096, 9.17781847, 9.11847894, 8.30369822, 
8.390247255, 8.546043325, 8.936300485, 8.73516157, 7.79617359, 
8.27044251, 8.300511065, 9.34370878, 9.73578054, 8.373799805, 
8.58729277, 7.80838416, 7.79045549, 8.02656027, 8.380940045, 
8.473533175, 7.74077554, 8.003188855), .Tsp = c(1973, 2008.75, 
12), class = "ts")