Which one is correct?
"a steady increase" or "an steady increase"?

Some examples from the web:

• And we're seeing a steady increase among males.
• There has been a steady increase in the quantities of drugs seized.
• Prices of imports from the PRC have shown a steady increase of 11,3 %.
• This data shows a steady increase if imports of solar modules and cells into the Indian market in terms of volume.
• It should also be noted that there has been a steady increase in sales and market share of the Community industry at the expense of dumped imports.
• It should also be noted that there has been a steady increase in sales and market share of the Community industry at the expense of subsidised imports.
• There was a very sharp dip in 2011 followed by a steady increase afterwards.
• There was a very sharp dip in 2011 followed by a steady increase afterwards.
• The average wage of the employees recorded a steady increase by 4 % every year in the period considered.
• However, the low quality and outdated design of [...] brand cars is leading to a steady increase in imports.
• a steady increase in bank loans contributed to a rising market.
• At present there is no Irish or EU register nor standard practice regulations for PEG feeding but reports indicate a steady increase in the use of this extremely invasive and dangerous procedure.
• There is general consensus on the need for a steady increase of RES in the energy mix and on the continuing need for economic support.
• Today, this ratio has been halved and among the 35000 or so new cases diagnosed each year there has been a gradual reduction in men and a steady increase in women.
• For a number of years it has been apparent that, with a falling birth rate and a steady increase in life expectancy, the population structure and age pyramid in the European Union will undergo profound changes between now and 2050.
• Second, the year 2009 - according to expert forecasts - will in all probability be the fifth successive year in which there has been a steady increase in the prices of foodstuffs.
• Globalisation creates the illusion that the general level of prosperity in the world is gradually increasing, but at the same time I note a steady increase in the gap between rich and poor in the Member States.
• there had been a steady increase in the frequency of journeys on domestic routes during this period, as shown below.
• A steady increase of the gas price at the beginning of 2006 brings back the result at 10,7 % during the RIP.
• Apart from Russia, that has a steady increase of exports, all the remaining countries present an incoherent evolution of exports with increases and decreases of quantities from year to year.

Some examples from the web:

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