Write SQL query to solve given problem: What is the percentage of reviews added each year of the total reviews added?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT CAST((SUM(CASE WHEN run_at LIKE '2022-%' THEN reviews_added ELSE 0 END) - SUM(CASE WHEN run_at LIKE '2021-%' THEN reviews_added ELSE 0 END)) AS REAL) * 100 / SUM(reviews_added) OR '%' "percentage" FROM runs