Year	X_i Drought	Y_i Boreholes	$x_{i} - \bar{x}$	$y_{i} - \bar{y}$	${(x_{i} - \bar{x})}^{2}$	${(y_{i} - \bar{y})}^{2}$	n	d_x	d_y	Z_xi	Z_yi	$Z_{x i} \times Z_{y i}$	r²	R
1982	0	1	0.72	2.39	0.52	5.71				3.5	0.09	0.31
1983	1	0	−0.3	3.39	0.08	11.5				−1.3	0.13	−0.2
1984	1	0	−0.3	3.39	0.08	11.5				−1.3	0.13	−0.2
1985	1	1	−0.3	2.39	0.08	5.71				−1.3	0.09	−0.1
1986	0	0	0.72	3.39	0.52	11.5				3.5	0.13	0.44
1987	1	0	−0.3	3.39	0.08	11.5				−1.3	0.13	−0.2
1988	0	0	0.72	3.39	0.52	11.5				3.5	0.13	0.44
1989	0	0	0.72	3.39	0.52	11.5				3.5	0.13	0.44
1990	1	0	−0.3	3.39	0.08	11.5				−1.3	0.13	−0.2
1991	1	1	−0.3	2.39	0.08	5.71				−1.3	0.09	−0.1
1992	1	3	−0.3	0.39	0.08	0.15				−1.3	0.01	−0
1993	1	0	−0.3	3.39	0.08	11.5				−1.3	0.13	−0.2
1994	1	1	−0.3	2.39	0.08	5.71				−1.3	0.09	−0.1
1995	1	0	−0.3	3.39	0.08	11.5				−1.3	0.13	−0.2
1996	1	0	−0.3	3.39	0.08	11.5				−1.3	0.13	−0.2
1997	0	0	0.72	3.39	0.52	11.5				3.5	0.13	0.44
1998	0	0	0.72	3.39	0.52	11.5				3.5	0.13	0.44
1999	1	1	−0.3	2.39	0.08	5.71				−1.3	0.09	−0.1
2000	1	0	−0.3	3.39	0.08	11.5				−1.3	0.13	−0.2
2001	0	1	0.72	2.39	0.52	5.71				3.5	0.09	0.31
2002	0	0	0.72	3.39	0.52	11.5				3.5	0.13	0.44
2003	0	3	0.72	0.39	0.52	0.15				3.5	0.01	0.05
2004	1	4	−0.3	−0.6	0.08	0.37				−1.3	−0	0.03
2005	0	6	0.72	−2.6	0.52	6.82				3.5	−0.1	−0.3
2006	1	4	−0.3	−0.6	0.08	0.37				−1.3	−0	0.03
2007	1	4	−0.3	−0.6	0.08	0.37				−1.3	−0	0.03
2008	1	3	−0.3	0.39	0.08	0.15				−1.3	0.01	−0
2009	1	5	−0.3	−1.6	0.08	2.6				−1.3	−0.1	0.08
2010	1	6	−0.3	−2.6	0.08	6.82				−1.3	−0.1	0.13
2011	1	24	−0.3	−21	0.08	425				−1.3	−0.8	1.03
2012	1	11	−0.3	−7.6	0.08	57.9				−1.3	−0.3	0.38
2013	1	9	−0.3	−5.6	0.08	31.5				−1.3	−0.2	0.28
2014	1	17	−0.3	−14	0.08	185				−1.3	−0.5	0.68
2015	1	9	−0.3	−5.6	0.08	31.5				−1.3	−0.2	0.28
2016	1	5	−0.3	−1.6	0.08	2.6				−1.3	−0.1	0.08
2017	1	3	−0.3	0.39	0.08	0.15				−1.3	0.01	−0
	26	122			7.22	947	36	0.21	27			4.1	0.12	11.7