CASE STUDY: HISTORICAL OF MAIN LINES AND PERSONNEL
Approaching the trend by mathematical models
Variable 1: main lines (1982=0)						Model approaching trend of main lines
Years	Years	Real LP	LP estimate*1000
reference	real	1000	total	annual
0	1982		2472
1	1983	2548	2552	80
2	1984	2641	2636	84
3	1985	2729	2723	88
4	1986	2818	2815	92
5	1987	2907	2911	96
6	1988	3001	3011	100
7	1989	3103	3115	104
8	1990	3223	3223	108
9	1991	3344	3335	112
10	1992	3466	3451	116
11	1993	3579	3572	120
12	1994	3681	3696	124
13	1995		3824	128
Variable 2: employees (1982=0)						Model approaching trend of personnel
Years	lines per	Employm	Employm estimate
reference	employee	total	total	annual
0	1982		18.056
1	1983	18.071	18.084	28
2	1984	18.089	18.111	27
3	1985	18.193	18.137	26
4	1986	18.181	18.162	26
5	1987	18.169	18.187	25
6	1988	18.188	18.211	24
7	1989	18.253	18.235	23
8	1990	18.209	18.258	23
9	1991	18.273	18.280	22
10	1992	18.339	18.301	21
11	1993	18.354	18.322	21
12	1994	18.313	18.342	20
13	1995		18.361	19