Table 1 Trend of the population residing in the territory under investigation (1971–2016, absolute values and percentage increase rate)

Acquaviva Platani

1.730

1.560

1.570

1.231

1.041

948

− 8.9

− 45.2

Bompensiere

780

742

722

677

610

556

− 8.9

− 28.7

Butera

7.130

6.238

5.673

5.376

4.937

4.754

− 3.7

− 33.3

Caltanissetta

60.051

61.146

61.319

61.438

61.711

63.360

2.7

5.5

Campofranco

4.830

4.582

4.150

3.632

3.218

3.100

− 3.7

− 35.8

Delia

5.120

4.855

4.537

4.350

4.325

4.277

− 1.1

− 16.5

Gela

67.050

74.806

72.535

72.774

75.668

75.827

0.2

13.1

Marianopoli

3.360

3.013

2.675

2.362

2.006

1.906

− 5.0

− 43.3

Mazzarino

15.150

15.076

13.373

12.627

12.333

12.145

− 1.5

− 19.8

Milena

3.800

3.795

3.644

3.446

3.178

3.018

− 5.0

− 20.6

Montedoro

2.610

2.021

2.010

1.780

1.643

1.631

− 0.7

− 37.5

Mussomeli

11.762

11.342

11.537

11.547

11.010

10.780

− 2.1

− 8.3

Niscemi

24.053

26.089

26.998

27.641

27.975

27.558

− 1.5

14.6

Resuttano

4.151

3.219

2.752

2.467

2.139

2.038

− 4.7

− 50.9

Riesi

15.989

15.085

12.506

11.746

11.814

11.586

− 1.9

− 27.5

San Cataldo

20.578

21.058

22.507

23.154

23.424

23.253

− 0.7

13.0

Santa Caterina

8.583

8.071

6.541

6.087

5.727

5.388

− 5.9

− 37.2

Serradifalco

6.850

6.400

6.441

6.423

6.265

6.091

− 2.8

− 11.1

Sommatino

8.917

7.692

8.226

7.875

7.267

7.038

− 3.2

− 21.1

Sutera

2.680

2.136

2.010

1.641

1.436

1.410

− 1.8

− 47.4

Vallelunga

4.940

4.596

4.397

3.845

3.641

3.461

− 4.9

− 29.9

Villalba

2.400

2.307

2.152

1.916

1.731

1.633

− 5.7

− 32.0

Totale

282.514

285.829

278.275

274.035

273.099

271.758

− 0.5

− 3.8