T1135: What is the meaning of "maximum funds held during the year"

I not have taken any capital from my funds nor any income. Over the course of the year my  assets have increased in value and then fallen back down again. So what do I enter in the box marked "Maximum funds held during the year"?? 

Secondly - theses assets have been purchased many years ago AND they were purchased piece meal. How would I calculate cost price??