What was the maximum rank of the source with renewable percentage w/o hydro is 2.17%?
CREATE TABLE "table1_25244412_2" (
  "rank" real,
  "rank_w_o_hydropower" real,
  "state" text,
  "pct_renewable" text,
  "pct_renewable_w_o_hydro" text,
  "renewable_electricity_gw_h" real,
  "renewable_electricity_w_o_hydro_gw_h" real,
  "total_electricity_gw_h" real
);
SELECT MAX("rank") FROM "table1_25244412_2" WHERE "pct_renewable_w_o_hydro"='2.17%';