Table 5. Average number of professional tournaments organised per period for specific world region (the total number of tournaments in a specific period divided by the number of years in a period).

Period	Africa	Asia	Central America	Europe	North America	Oceania	South America
P1	0	.2	.2	11.8	7.8	2.6	0
P2	0	1.0	.2	16.2	9.2	3.8	0
P3	.8	1.2	0	18.0	10.6	3.4	0
P4	.8	2.2	.4	24.6	12.2	4.0	1.0
P5	1.0	4.4	.8	28.2	13.0	4.0	1.2
P6	1.0	4.6	1.0	29.4	13.0	4.0	2.6
P7	1.0	6.o	1.0	30.8	14.0	4.0	3.0