[bug] EOY returns vs benchmark on time range longer than 10y

[julienlau]

Hi,

Thanks for your work.
I think there might be a display bug on graph EOY returns vs benchmark.

Bug disappear if I limit time range to less than 10y. here it is 10y and a half.

[atharvajoshi01]

probably _plotting/core.py L272-277 in plot_returns_bars. when len(years) > 10 it tries to sparsify x-tick labels but the math means for 11-19 years mod=1, so every label still draws while the explicit _plt.xticks(np.arange(len(years)), ...) call sets positions that may not match where pandas put the bars. could you share what looks wrong exactly, are the bar values off or just the year labels misaligned? if it's labels i can put up a PR to bump the sparsification threshold to ~20 years and only override xticks when actually sparsifying.