How to get grid rows evenly spaced

I have a grid that I am trying to build in Xamarin.Forms using the following MainPage.Xaml.

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:d="http://xamarin.com/schemas/2014/forms/design"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d"
             BackgroundColor="Blue"
             x:Class="GridShit.MainPage">


    <Grid Margin="20,55,10,0">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="0.5*" />
            <ColumnDefinition Width="0.15*" />
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="50" />
            <RowDefinition Height="50" />
        </Grid.RowDefinitions>
        <Label Text="Input :" 
         TextColor="DarkOrange"
         FontSize="Title"
         FontAttributes="Bold"/>
        <Label Grid.Column="1"
           Text="" />
        <Label Grid.Row="1"
           Text="IBO (feet per second):"         
           TextColor="White" 
           FontSize="Title"/>
        <Label Grid.Column="1"
           Grid.Row="1"
           Text="[343]"
           FontSize="Large"/>
        <Label Grid.Row="2"
           Text="Draw Length (inches):"
           TextColor="White" 
           FontSize="Title"/>
        <Label Grid.Column="1"
           Grid.Row="2"
           Text="[26]" />
        <Label Grid.Row="3"
           Text="Draw Weight (pounds):"
           TextColor="White" 
           FontSize="Title"/>
        <Label Grid.Column="1"
           Grid.Row="3"
           Text="[52]" />
        <Label Grid.Row="4"
           Text="Arrow Weight (grains):"
           TextColor="White" 
           FontSize="Title"/>
        <Label Grid.Column="1"
           Grid.Row="4"
           Text="[365]" />

    </Grid>


</ContentPage>
`

But the rows are uneven.

How can I make them even like the first three rows ?