List the number of years where ritchie ocampo was the mutya ng pilipinas winner.
CREATE TABLE table_24430894_20 (year VARCHAR, mutya_ng_pilipinas_asia_pacific VARCHAR)
SELECT COUNT(year) FROM table_24430894_20 WHERE mutya_ng_pilipinas_asia_pacific = "Ritchie Ocampo"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_24430894_20 (year VARCHAR, mutya_ng_pilipinas_asia_pacific VARCHAR) Question: List the number of years where ritchie ocampo was the mutya ng pilipinas winner. [/INST] SELECT COUNT(year) FROM table_24430894_20 WHERE mutya_ng_pilipinas_asia_pacific = "Ritchie Ocampo" </s>