how many parks are name beltzville state park?
CREATE TABLE "current_pennsylvania_state_parks" (
  "park_name" text,
  "county_or_counties" text,
  "area_in_acres_ha" text,
  "date_founded" real,
  "stream_s_and_or_lake_s" text
);
SELECT COUNT("date_founded") FROM "current_pennsylvania_state_parks" WHERE "park_name"='beltzville state park';