Write SQL query to solve given problem: What percentage of the border does Angola share with each of the countries with which it borders?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT SUM(CASE WHEN T2.Name = 'Angola' THEN T1.Length ELSE 0 END) * 100 / SUM(T1.Length) FROM borders AS T1 LEFT JOIN country AS T2 ON T1.Country1 = T2.Code