How much can a stat be lowered in battle?

Question

Is there a set amount to how many stages you can raise/lower a Pokemon's stats in battle?

Answer 1

-6-25%
-5-29%
-4-33%
-3-40%
-2-50%
-1-66%
0-100%
+1-150%
+2-200%
+3-250%
+4-300%
+5-350%
+6-400%

Whenever you use a move like howl that raises it one stage, and when moves say harshly fell or sharply rose, then that means 2 stages up or down.

Comments

See also this related question: http://pokemondb.net/pokebase/1400/how-much-do-stat-raising-moves-power-them-up