public int percentageOfGreenArea() {
		int amount = 0;
		
		for (Cuboid c : cuboids.values()) {
			if (c != null)
				if (CuboidType.getType(c.getCuboidType()) == CuboidType.Park || CuboidType.getType(c.getCuboidType()) == CuboidType.Sight) amount++;
		}
		
		return (int) ((double) amount / amountOfCuboids() * 100);
	}