The changing influence of city-systems on global shipping networks: an empirical analysis

Journal of Shipping and Trade

Table 3 Statistical characterization of demographic quantiles, 1950–1990

Quantiles	Thresholds (000 s inhabitants)
Quantiles	1950	1960	1970	1980	1990
1	9	6	5	30	84
2	46	65	93	122	144
3	90	114	139	193	230
4	155	183	242	310	380
5	290	351	441	532	633
6	711	917	1,067	1,128	1,403
6^a	17,363	20,548	23,585	25,978	28,738
Quantiles	Population share (% inhabitants)
Quantiles	1950	1960	1970	1980	1990
1	0.8	1.0	1.2	1.6	1.7
2	1.9	2.1	2.3	2.7	2.6
3	3.5	3.5	3.8	4.2	4.3
4	6.4	5.9	6.5	7.2	7.0
5	12.8	13.1	13.2	14.0	13.8
6	74.6	74.3	73.0	70.3	70.5
World	100.0	100.0	100.0	100.0	100.0
Quantiles	Mean population (000 s inhabitants)
Quantiles	1950	1960	1970	1980	1990
1	28	42	61	93	117
2	66	88	114	151	183
3	119	148	185	245	292
4	223	252	315	406	482
5	439	531	647	789	956
6	2,553	3,098	3,589	4,007	4,822
World	574	693	817	949	1,145
Quantiles	Standard deviation (000 s inhabitants)
Quantiles	1950	1960	1970	1980	1990
1	9	14	19	17	14
2	13	15	14	22	23
3	18	21	26	34	45
4	42	50	57	68	70
5	117	152	160	171	221
6	2,731	3,302	3,982	4,377	4,780
World	1,435	1,731	2,052	2,261	2,574