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1977 — 310,467

1978 — 271,879

1979 — 234,286

1980 — 336,119

1981 — 266,604

1982 — 227,428

1983 — 291,618

1984 — 253,048

1985 — 266,012

1986 — 289,117

1987 — 285,439

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1988 — 269,073

1989 — 288,586

1990 — 316,336

1991 — 337,915

1992 — 337,209

1993 — 319,322

1994* — 214,194

1995 — 221,113

1996 — 200,125

1997 — 206,438

1998 — 193,451

1999 — 200,142

*In 1994, the National Park Service reduced the statistical multiplier
estimating visitors per car.

Source: National Park Service