static double changes(double was, double is) {
		if (was == 0)
			return 1;
		if (is == 0)
			return -1;
		if (was == -1e-7 || is == -1e-7
				|| (int) (1e9 * ((is - was) / was)) == -9999 || was < 0
				|| is < 0) {
			// System.out.println("PERCENTAGE CHANGE ERROR VALUE: -1E-7");
			return -1e-7;
		}

		return (is - was) / was;
	}