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. 2008 Feb 4;105(7):2295–2300. doi: 10.1073/pnas.0709893105

Fig. 1.

Fig. 1.

Annual per capita visitation to the various U.S. and international public lands in this study. Included were U.S. National Parks (variable NPV, range of time series 1939–2006, n = 68), U.S. State Parks (SPV, 1950–2003, n = 24), U.S. National Forests (NFV, 1939–2002, n = 61), U.S. Bureau of Land Management sites (BLMV, 1982–2005, n = 20), Japanese National Parks (JapanNPV, 1950–2005, n = 56), and Spanish National Parks (SpainNPV, 1996–2006, n = 11). Linear regressions for declines from identifiable peaks in NPV (1987) and JapanNPV (1991) are represented by lines and equations.