New Zealand's regional populations

It's no wonder New Zealand has significant infrastructure challenges, when its population is so sparse in many regions. The Thirty Year New Zealand Infrastructure Plan 2015 includes the following statistics:
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2013 population as percentage of national total
Northland - 4%
Auckland - 34%
Waikato - 10%
Bay of Plenty - 6%
Gisborne - 1%
Hawkes Bay - 4%
Taranaki - 3%
Manawatu-Wanganui - 5%
Wellington - 11%
Tasman - 1%
Nelson - 1%
Marlborough - 1%
West Coast - 1%
Canterbury - 13%
Otago - 5%
Southland - 2%