**Table 8:** Cluster formation rates (CFR) and cluster lifetimes ( $\tau$ ).
No	CFR	$\tau$	$N_{\rm cl}$	Sample	Note
	kpc^-2 Myr^-1	Myr
1	0.10 $\pm$ 0.01	256 $\pm$ 12	652	tot
2	0.31 $\pm$ 0.03	327 $\pm$ 25	259	cmp
3	0.23 $\pm$ 0.03	322 $\pm$ 31	195	fld
4	0.10	231	70	w71	1
5	0.18	144	112	p86	2
6	0.25	100	213	j88	3
7	0.45	14	100	b91	4

Sample: No. 1...3 are the present study, No. 4...7 are taken from the literature; tot - the total sample; cmp - the sample of clusters within the completeness area; fld - the sample of field clusters within the completeness area; w71 - Wielen (1971); p86 - Pandey & Mahra (1986); j88 - Janes et al. (1988); b91 - Battinelli & Capuzzo-Dolcetta (1991).
Notes: 1 - the Becker & Fenkart (1971) sample; 2 - the Lund catalogue, 3rd edition; 3 - the Lund catalogue, 5th edition; 4 - clusters with $d\le 2$ kpc and $V_{\rm integr} \le -4.5$ mag.

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