Source units show rounded equivalents in parentheses. Choosing a measurement system shows that system alone; originals stay in source information. Currency uses the observation year’s sourced annual average; unavailable rates and PPP figures retain their original units.
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NPS VISITOR USE STATISTICS
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National Park Service visitor use statistics ↗ ·
Source reporting units can cover multiple park entries. Each reporting series appears once in the ranked table. A missing year is not treated as zero.