;4th quarter 2017;Change in per cent;Change in per cent;3rd quarter 2017;4th quarter 2016;Breakdown of electricity sales by volume. Per cent; Last 3 mos.;Last 12 mos.; HOUSEHOLDS;36.0;8.1;-4.3;33.3;37.6;100.0; New fixed-price contracts, 1-year or less, households;30.6;-1.3;-1.6;31.0;31.1;0.2; New fixed-price contracts, more than 1-year, households;34.3;7.2;14.7;32.0;29.9;0.1; Older fixed-price contracts, households;30.6;-4.1;3.0;31.9;29.7;1.4; Contracts tied to spot price, households;34.9;8.0;-4.6;32.3;36.6;71.8; Variable price contracts, households;39.0;8.3;-3.9;36.0;40.6;26.5; SERVICES;32.8;10.1;-7.6;29.8;35.5;100.0; New fixed-price contracts, services;28.9;-2.7;-9.1;29.7;31.8;1.1; Older fixed-price contracts, services;28.8;-1.4;-8.3;29.2;31.4;4.8; Contracts tied to spot price, services;32.8;10.4;-8.1;29.7;35.7;88.3; Variable price contracts, services;36.4;13.0;3.7;32.2;35.1;5.8; MANUFACTURING EXCL. ENERGY-INTENSIVE MANUFACTURING;32.5;12.5;-7.1;28.9;35.0;100.0; New fixed-price contracts, manufacturing excl. energy-intensive manufacturing;30.6;-18.2;-10.8;37.4;34.3;0.6; Older fixed-price contracts, manufacturing excl. energy-intensive manufacturing;29.6;1.4;-2.3;29.2;30.3;6.7; Contracts tied to spot price, manufacturing excl. energy-intensive manufacturing;32.6;13.2;-7.1;28.8;35.1;89.9; Variable price contracts, manufacturing excl. energy-intensive manufacturing;36.7;14.0;1.1;32.2;36.3;2.8; ENERGY-INTENSIVE MANUFACTURING;28.8;2.1;-4.0;28.2;30.0;100.0; Fixed-price contracts and contracts not entered in the market, energy-intensive manufacturing;:;:;:;:;:;:; Contracts tied to spot price, energy-intensive manufacturing;29.7;16.9;-12.1;25.4;33.8;:;