When answering this question, it's useful to clarify a few things.
First, it's important to clarify what we mean by a "settlement". As you learned in the comments, there are settlements and settlement outposts. Settlement outposts are considered illegal under Israeli law, and are established without the explicit permission of the Israeli government. They tend to be illegal, and most would be uprooted in all Israeli proposals for a two-state solution.
Settlement blocks, suburbs of East Jerusalem, and cities in the West Bank, however, are established either by the Israeli government or with its permission. These settlements can often have populations of tens of thousands, like Ma'ale Adumim or Modi'in Illit, and the Israeli government will, with some regularity, announce the construction of new housing units within or near these settlements.
Israel intends to keep these settlements, even if a Palestinian state would be created, and most frameworks for a two-state solution call for a solution based on the 1949 armistice lines with mutually agreed land swaps such that Israel can retain some of its settlements.
It is worth noting that Israel does not consider suburbs of East Jerusalem settlements, as Israel annexed East Jerusalem in 1967. However, the Palestinian Authority and the International Community consider all settlements -- whether outposts, cities, or suburbs of East Jerusalem -- illegal under international law. But that's a whole other discussion.
Second, it is important to clarify what we mean by settlement growth. Settlement growth can be measured in two ways; it can be measured by population growth, or by growth in terms of physical area covered by settlement infrastructure.
Since Oslo, the population of settlements (including areas of East Jerusalem) has grown substantially. In 1993, there were under 200,000 Israelis living in East Jerusalem and the West Bank, whereas now there are over 500,000.
Critics of Israeli settlements will sometimes use these statistics to argue that Israel is attempting a de facto annexation of the West Bank, and that growth in settlements constitutes a land grab. However, to analyze this claim, we have to look at not just the population growth of settlements, but their growth in terms of land area.
In terms of land area, settlements have not grown meaningfully since the Oslo Accords, comprising around 2% of West Bank land area. This is because Israeli has not established new settlement blocks since the Oslo Accords, but instead accommodates population growth in settlements through construction in existing settlements.
We can see additional evidence of the relative lack of growth of Israeli Settlements in terms of land area by examining Israel's offers to the Palestinians and seeing how much land area Israel was willing to cede. Under an Israeli offer in the 2000 Camp David Summit, Israel would have retained around 9% of the West Bank, before counting land swaps. Under Israeli Prime Minister Olmert's offer to the Palestinians in 2008, Israel would have retained 6.8% of the West Bank, before land swaps.
As you can see, there are a number of ways to measure Israeli settlement expansion, and using just one measurement wouldn't give you the whole picture. The most succinct way to answer your question would be to say that Israeli settlements have been growing in population, with hundreds of housing units constructed per year, but that they have not been growing in terms of land area.