50% of people got this right

Let's call the original number of attempts $x$ .

In order for the percentage of successful attempts to increase from $50\%$ to $51\%$ , we have that $\frac{1018}{x}\times 100$ rounds to $50$ , and $\frac{1019}{x+1}\times 100$ rounds to $51$ .

This firstly lets us know that $\frac{1018}{x}\times 100<50.5\implies 2015.84<x$ ,

whilst also telling us that $\frac{1019}{x+1}\times 100>50.5\implies x<2016.82$ .

The only integer solution that fits these boundaries is $x=2016$ , and so $2017$ people, including yourself, attempted the problem.