Update injury_reporting_rate param for underreporting injury numbers

[usr110]

Based on @rahulatiitd's document on injury underreporting deaths, below are the values for the cities to take care of them:

(the doc is located at: Dropbox\ITHIM Global\article write up\LATAM_paper\underrepporting of road deaths latam.xlsx)

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city	sao_paulo	belo_horizonte	bogota	santiago	mexico_city	buenos_aires	medellin	cali	montevideo	antofagasta	arica	copiapo	coquimbo_laserena	iquique_altohospicio	osorno	puerto_montt	san_antonio	temuco_padrelascasas	valdivia	gran_valparaiso
injury_reporting_rate	0.942546	0.942546	0.796484	0.746102	0.958984	0.903742	0.796484	0.796484	0.969565	0.746102	0.746102	0.746102	0.746102	0.746102	0.746102	0.746102	0.746102	0.746102	0.746102	0.746102

[usr110]

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Country	Reported	Modelled by WHO	Correction factor	ithim-r injury_reporting_rate param
Chile	1675	2245	1.34	0.746102
Colombia	7158	8987	1.26	0.796484
Brazil	38651	41007	1.06	0.942546
Argentina	5530	6119	1.11	0.903742
Peru	2696	4286	1.59	0.629025
Venezuela	7028	10640	1.51	0.660526
Uruguay	446	460	1.03	0.969565
Mexico	16039	16725	1.04	0.958984
Source	World Health Organization. Global status report on road safety 2018. World Health Organization, 2018. https://www.who.int/publications/i/item/9789241565684