Use ceroacero.es with this link as your start point just to look at penalties
http://www.ceroacero.es/edicao_stats.php?id_edicao=2328&v=jt1&o=PEN&sc=0&pais=0&pos=0&id_equipa=40
Thanks for the link.
You are right, before this penalty galore in favour of Real Madrid, Barcelona had more penalties awarded during the previous five seasons. Sounds impressive, isn't it?
Now let's see how many goals Barca scored during that period, 105+76+78+80+73= 412 goals whereas RM scored 83+84+66+70+71= 374 goals.
RM were awarded 25 penalties and Barcelona 31, a whopping 6 more penalties in a five year period.
Barcelona scored 7.5 % of their goals via penalty kicks, whereas RM scored 6.7% of theirs. Not even a 1% diference.
Now let's see in the last three seasons.
RM have scored 102 + 102 + 79 = 283 goals of which 28 of them came via penalty kick.
That is 9.5 % of their goals.
Barcelona have scored 98+95+68= 261 goals of which 10 were scored from the spot.
3.8%.
A significant difference.