Tricky question and the normal answer is 100 - 300 pounds for a dwarf
How Much to Plant for a Year's Supply of Fruit - The Seasonal Homestead.
The standard tree which i have brought up before yields heavier.
“A pear tree begins to bear fruit when it is about four years old, and may live 50 to 75 years.
• A 25-year-old pear tree yields 1,250 to 2,250 pounds
(570 to 1,020 kg) of pears a year.”
Educators_Flyer_Pear.pdf (1.1 MB)
The standards many advantages and disadvantages , if you want to read more it can be found here